<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img
        src="http://gips0.baidu.com/it/u=4248708052,2809939788&fm=3028&app=3028&f=JPEG&fmt=auto?w=1280&h=720" alt="" />
    </div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length>0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr active" v-for="(item,index) in fruitList" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" @click="ckeck" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{item.price}}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="change(index,-1)"> - </button>
                <span class="my-input__inner">{{item.num}}</span>
                <button class="increase" @click="change(index,1)"> + </button>
              </div>
            </div>
            <div class="td">{{item.num*item.price}}</div>
            <div class="td"><button @click="delproduct(item.id)">删除</button></div>
          </div>

        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" :checked="isallcheck()" @click="allcheck" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{totalMoney}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{xtotal}} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
  <script src="../../vue/vue.js"></script>
  <script>




    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList: [
          {
            id: 1,
            icon: 'https://img1.baidu.com/it/u=2387725660,995740484&fm=253&fmt=auto&app=120&f=JPEG?w=500&h=500',
            isChecked: true,
            num: 2,
            price: 6,
          },
          {
            id: 2,
            icon: 'https://img0.baidu.com/it/u=2227927646,3910360066&fm=253&fmt=auto&app=138&f=JPEG?w=800&h=1561',
            isChecked: false,
            num: 7,
            price: 20,
          },
          {
            id: 3,
            icon: 'https://img1.baidu.com/it/u=2609743990,2540982358&fm=253&fmt=auto&app=120&f=JPEG?w=361&h=505',
            isChecked: false,
            num: 3,
            price: 40,
          },
          {
            id: 4,
            icon: 'https://img2.baidu.com/it/u=3823574794,2352244676&fm=253&fmt=auto&app=120&f=JPEG?w=1200&h=800',
            isChecked: true,
            num: 10,
            price: 3,
          },
          {
            id: 5,
            icon: 'https://ns-strategy.cdn.bcebos.com/ns-strategy/upload/fc_big_pic/part-00619-4032.jpg',
            isChecked: false,
            num: 20,
            price: 34,
          },
        ],

      },
      // 数据变化 ===》持久化
      watch: {
        fruitList: {
          deep: true,
          immediate: true,
          handler(newdatas) {

            // //立即执行：
            // if (localStorage.getItem('datas')) {
            //   this.fruitList = JSON.parse(localStorage.getItem('datas'))
            // }


            // 防抖  0.5秒内执行最后一次
            clearTimeout(this.timeNo);
            this.timeNo = setTimeout(() => {
              console.log(newdatas);
              localStorage.setItem('datas', JSON.stringify(newdatas))
            }, 500)

          }
        }
      }
      ,
      computed: {
        // 计算结算数量：
        xtotal() {
          return this.fruitList.filter(item => item.isChecked).reduce((sum, next) => sum + next.num, 0);
        },
        //计算总金额
        totalMoney() {
          return this.fruitList.filter(item => item.isChecked).reduce((sum, next) => sum + next.num * next.price, 0);
        },

      },
      methods: {
        delproduct(id) {
          console.log('删了', id);

          this.fruitList = this.fruitList.filter(item => item.id !== id);
        },
        change(index, nums) {
          this.fruitList[index].num += nums;
          // this.fruitList[index].num = this.fruitList[index].num < 0 ? 0 : this.fruitList[index].num;
          if (this.fruitList[index].num <= 0) {
            this.fruitList[index].num = 0;
            this.fruitList[index].isChecked = false;
          }
        },
        isallcheck() {
          // console.log(111);
          // console.log(this.fruitList.filter(item => !item.isChecked).length > 0);

          return !this.fruitList.filter(item => !item.isChecked).length > 0
        },
        allcheck() {
          console.log(this.isallcheck());

          if (!this.isallcheck()) {
            this.fruitList.forEach(element => {
              element.isChecked = true
            });
          } else {
            this.fruitList.forEach(element => {
              element.isChecked = false
            });
          }

        },
        ckeck() {

        }
      }
    })
  </script>
</body>

</html>